@import url('https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css');
.f{
    width: 100px;
    height: 100px;
    display: grid;
    grid: auto;
    border:.5px  solid aqua ;
}
.s,.g{
    width: 80%;
    height: 80%;
    border:.5px  solid rgb(19, 131, 53) ;
    display: flex;
    margin: auto;

}
.scroll{
    height: 300px;
    overflow: auto;
}